Navien NPE-180A Error Codes
Tankless Water Heater
4 error codes are documented for this specific model, cross-checked against manufacturer service documentation.
- E109 Tankless Water Heater E109 — Fan Motor Abnormal Operation
- E110 Tankless Water Heater E110 — Exhaust Blockage / APS Fault
- E432 Tankless Water Heater E432 — Cold Water Inlet 2 Thermistor Fault
- E760 Tankless Water Heater E760 — Flushing/Service Reminder
Source: Navien NPE User's Information Manual (NPE-180A/210A/240A, NPE-S), 5.2 Understanding Error Codes, p.16. Some of these fault codes may also apply to other models built on the same control platform — check your own model's meaning page for confirmation.